Negative pressure air curtain device suitable for thin film conveying and cast film machine with negative pressure air curtain device

Abstract

The utility model discloses a negative pressure air curtain device suitable for thin film conveying and a cast film machine with the same, the negative pressure air curtain device suitable for thin film conveying comprises a first air draft part and a second air draft part which are oppositely arranged, and at least one flow equalizing plate is arranged in each of the first air draft part and / or the second air draft part. A channel space is formed between the first air draft part and the second air draft part, and the width of the channel space is matched with the width of the film. According to the scheme, the two oppositely-arranged air draft parts are used for conducting air draft at the same time, the flow equalizing plates are arranged so that the uniformity of the airflow intensity can be guaranteed, a negative pressure air curtain is formed in the channel space between the two air draft parts, the film can be conveyed in the front space and the rear space through the channel space, and due to the fact that the negative pressure air curtain exists between the two spaces, the film can be conveyed in the front space and the rear space. The problems of mutual influence of temperature and gas of the two are avoided, and the accuracy and stability of the high-end process on process environment control are effectively ensured.

Description

Technical Field

[0001] This utility model belongs to the technical field of film production equipment, specifically relating to a negative pressure air curtain device suitable for film conveying and a casting film machine having the same. Background Technology

[0002] Existing air curtain devices generally form an air curtain by blowing out a strong airflow. However, they cannot be used in some process equipment. For example, in casting film equipment, some ovens contain films with high solvent content, such as slurries or wet films. Strong airflow cannot impact the film surface, otherwise it will affect the film quality. Therefore, existing ovens and other equipment of this type do not have air curtains and are connected spaces. However, in some high-end processes, such as polyimide film production equipment, it is desirable to ensure that the temperature and air in different areas of the ovens and other equipment are isolated to avoid mutual interference and difficulty in accurately controlling the process environment. Therefore, a special new type of air curtain device needs to be designed. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a negative pressure air curtain device suitable for film conveying and a casting film machine having the same, so as to solve the problem that the strong airflow blown out by the existing air curtain device will affect the process quality, and to achieve the technical effect of isolating the temperature and air in different areas of the process equipment by forming an air curtain through negative pressure.

[0004] According to the technical solution of this utility model, this utility model provides a negative pressure air curtain device suitable for film conveying, including a first exhaust section and a second exhaust section arranged opposite to each other. At least one flow equalization plate is provided in the first exhaust section and / or the second exhaust section. A channel space is formed between the first exhaust section and the second exhaust section, and the width of the channel space is adapted to the width of the film.

[0005] Furthermore, the entrance and / or exit of the passage space are equipped with an adjustable windbreak mechanism, which has reserved space to adapt to the thickness of the membrane.

[0006] Furthermore, the adjustable wind deflector includes at least one slit baffle located on the first exhaust section and / or the second exhaust section.

[0007] Furthermore, a wind speed acquisition device is installed at the flow equalization plate, and a wind speed adjustment mechanism is connected to the outside of the first exhaust section and / or the second exhaust section.

[0008] Furthermore, the first exhaust unit and the second exhaust unit are arranged vertically and vertically respectively.

[0009] Furthermore, the flow equalization plates inside the first exhaust section and / or the second exhaust section are arranged in multiple layers. The multi-layer flow equalization plates are arranged parallel to the film conveying direction or inclined to the film conveying direction. The flow equalization plates have a number of air holes or a number of slit holes. The air holes or slit holes in each layer are arranged opposite to each other or staggered.

[0010] Furthermore, the first exhaust unit and / or the second exhaust unit are connected to exhaust ducts, and the wind speed adjustment mechanism is located at the outer end of the exhaust duct; it also includes channel side plates located on both sides, and the channel side plates together with the flow equalization plates of the first exhaust unit and the second exhaust unit form the side wall of the channel space.

[0011] According to the technical solution of this utility model, this utility model also provides a casting film machine, which includes several working areas, and the working areas are separated by a negative pressure air curtain device suitable for film conveying of this utility model.

[0012] Furthermore, the work areas are separated by partitions, and each partition is equipped with a negative pressure air curtain device suitable for film conveying.

[0013] Furthermore, each working section is provided with a set of opposing negative pressure air curtain devices for film conveying, located on the inlet and outlet sides respectively, or only on the inlet side of the working section, or only on the outlet side of the working section.

[0014] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0015] In this invention, a negative pressure air curtain device consists of two oppositely arranged exhaust units that simultaneously draw air, each equipped with a flow equalization plate to ensure the uniformity of airflow intensity. A negative pressure air curtain is formed in the channel space between the two exhaust units. The film can be transmitted between the front and rear spaces through the channel space. Because there is a negative pressure air curtain between the two spaces, problems such as temperature and gas mutual influence (e.g., gas of different temperature and composition content escaping / crossing) are avoided, effectively ensuring the accuracy and stability of process environment control for high-end processes. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram based on an embodiment of the present utility model.

[0017] Figure 2 yes Figure 1 Rear view diagram.

[0018] Figure 3 yes Figure 1 A left-side view diagram.

[0019] Figure 4 This is a cross-sectional structural diagram according to another embodiment of the present utility model.

[0020] Figure 5 This is a schematic diagram of the structure of a casting film machine with a negative pressure air curtain device according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. First exhaust section; 2. Second exhaust section; 3. Flow equalization plate; 4. Channel space; 5. Channel side plate; 6. Slit baffle; 7. First airtight air box; 8. Second airtight air box; 9. First exhaust duct; 10. Second exhaust duct; 11. Wind speed acquisition device; 12. Wind speed adjustment mechanism. Detailed Implementation

[0023] This invention provides a negative pressure air curtain device suitable for film conveying and a casting film machine having the same, which solves the problem that the strong airflow blown out by existing air curtain devices will affect the process quality, and realizes the technical effect of forming an air curtain through negative pressure to isolate the temperature and air in different areas of the process equipment; of course, the application of this invention is not limited to this, and it can also be used in other fields outside of process equipment.

[0024] Please see Figures 1 to 3 This utility model discloses a negative pressure air curtain device suitable for film conveying, comprising a first exhaust section 1 and a second exhaust section 2 arranged opposite to each other. At least one flow equalization plate 3 is provided in both the first exhaust section 1 and / or the second exhaust section 2. A channel space 4 is formed between the first exhaust section 1 and the second exhaust section 2, the width of which is adapted to the width of the film. It should be noted that the opposite orientation of the first exhaust section 1 and the second exhaust section 2 refers to the opposite orientation of the exhaust ports; in other words, both have through holes (or air vents) on their inward-facing sides for air passage. These air vents can be directly formed on the exhaust section (such as a bellows) or located on the flow equalization plate 3. To ensure the effectiveness of the negative pressure air curtain, this solution specifies that at least one exhaust section uses a flow equalization plate 3. The flow equalization plate 3 can be a single piece, or multiple pieces or multiple layers, which will be further described later. The dimensions of the channel space 4 are adapted to the membrane, which can better ensure the formation of isolated partitions on both sides of the negative pressure air curtain device. Specifically, the width of the membrane is generally greater than or equal to the width.

[0025] During operation, the first exhaust section 1 and the second exhaust section 2 simultaneously perform exhaust. The flow equalization plate 3 ensures uniform airflow. Without the flow equalization plate, problems arise such as higher airflow near the exhaust section (e.g., exhaust duct) and insufficient airflow further away. The passage space 4 allows materials (e.g., films) conveyed in the process equipment to pass through. The films are not subjected to strong airflow impacts as they pass through. The airflow in the two spaces separated by the negative pressure air curtain device is drawn away by the first exhaust section 1 and the second exhaust section 2 when it reaches the vicinity of the negative pressure air curtain device, preventing airflow from the previous space from entering the next space, and vice versa. This ensures that the environments of adjacent spaces are relatively independent, while also guaranteeing the ventilation effect within the equipment.

[0026] Preferably, the inlet and / or outlet of the channel space 4 has an adjustable baffle mechanism. The adjustable baffle mechanism has a space adapted to the thickness of the film. The adjustable baffle mechanism is used to further reduce the inlet / outlet. For example, if the thickness of the film (and steel strip) is about 1.2mm to 1.5mm, the adjustable baffle mechanism will reduce the inlet / outlet to close to this thickness value, thereby better separating the two spaces before and after the negative pressure air curtain device and preventing the inlet / outlet from being too large and allowing gas to escape. For example, the adjustable baffle mechanism includes at least one slit baffle 6 located on the first exhaust section 1 and / or the second exhaust section 2. The slit baffle 6 is two upper and lower baffles that are sealed and fixed on the outside. The slit baffle 6 forms a slit at the inlet and / or outlet of the channel space 4. The optimal size of the slit is adapted to the thickness of the film. The distance between the first exhaust section 1 and the second exhaust section 2 should not be too close. Therefore, the size of the inlet and / or outlet of the channel space 4 can be further defined by the slit baffle 6, and preferably the position and size of the slit are adjustable (e.g., formed by two detachable / adjustable baffles). More specifically, for example, the slit is located in a central position between the first exhaust section 1 and the second exhaust section 2, so that the distance between the film and the first exhaust section 1 and the second exhaust section 2 is substantially the same. This solution is particularly suitable for, for example, oven-type equipment for thin films, where the slit baffle 6 allows thinner films to pass through while preventing gases (such as harmful / flammable gases) inside the oven from escaping from the oven or a certain process space within the oven. It is conceivable that in other feasible embodiments, the adjustable baffle mechanism is a plate with a slit, or a pipe-like structure, or further provided with a flow guiding / filtering structure, etc., all of which are intended to serve as a barrier and do not depart from the concept of this solution.

[0027] Preferably, the system further includes channel side plates 5 disposed on the outer sides of the first exhaust section 1 and the second exhaust section 2. The channel side plates 5, together with the flow equalization plates 3 of the first exhaust section 1 and the second exhaust section 2, form the four side walls of the channel space 4. Therefore, in practical applications, the position and size of the channel space 4 are no larger than the connection opening between the two spaces, and it is sealed to the connection opening, ensuring that the airflow at the connection opening can only flow to the first exhaust section 1 and the second exhaust section 2, and cannot escape from other places around the connection opening. It is understood that for cases where the process space is small or the first exhaust section 1 and the second exhaust section 2 are large, the side walls of the process space can be equivalent to the side walls of the channel space, effectively achieving the desired effect, thus eliminating the need for channel side plates 5 (and other structures restricting the connection opening).

[0028] In some embodiments, both the first exhaust section 1 and the second exhaust section 2 are strip-shaped to adapt to the width of the spatial connection opening; the flow equalization plate 3 is a porous strip-shaped flat plate, and the flow equalization plates 3 of the first exhaust section 1 and the second exhaust section 2 are parallel. This solution is small in size while achieving the required functions, making it convenient for production and use. For example, in film drying ovens, there are also heating components such as components for blowing out hot air, so the air curtain device should not be too large to ensure the uniformity and efficiency of the main heating effect. In addition, if the air curtain device is too large, it will also affect the overall size of the equipment box, resulting in increased costs, low heating efficiency, and poor heat preservation. The first exhaust section 1 and the second exhaust section 2 are arranged vertically to adapt to the laterally conveyed film.

[0029] More specifically, the negative pressure air curtain device includes a first airtight air box 7 and a second airtight air box 8; the first airtight air box 7 is connected to a first exhaust pipe 9, and has a first exhaust section 1 on the side facing the second airtight air box 8; the second airtight air box 8 is connected to a second exhaust pipe 10, and has a second exhaust section 2 on the side facing the first airtight air box 7. A flow equalization plate 3 is matched with the first airtight air box 7 and the second airtight air box 8 to ensure airflow uniformity. A channel side plate 5 and a slit baffle 6 (if present) are provided on the first airtight air box 7 and the second airtight air box 8. Preferably, first exhaust pipes 9 are provided on both sides of the first airtight air box 7, and second exhaust pipes 10 are provided on both sides of the second airtight air box 8; this method of connecting exhaust pipes on both sides further helps to ensure uniform airflow throughout the flow equalization plate 3.

[0030] Further, please refer to Figure 4A wind speed acquisition device 11 (such as an anemometer) is installed at the flow equalization plate 3. A wind speed adjustment mechanism 12 (such as a speed-regulating fan, or an independent air-regulating valve, etc.) is connected to the outside of the first exhaust section 1 and / or the second exhaust section 2 via exhaust ducts, thereby enabling the monitoring and adjustment of wind speed. Specifically, the first exhaust section 1 and / or the second exhaust section 2 are connected to exhaust ducts, which include, for example, a first exhaust pipe 9 and a second exhaust pipe 10. The wind speed adjustment mechanism 12 is located at the outer end of the exhaust ducts. Preferably, the wind speed acquisition device 11 is also electrically connected to the wind speed adjustment mechanism 12, enabling signal transmission and thus achieving automatic adjustment and control based on wind speed. More specifically, the ends of the first exhaust pipe 9 and the second exhaust pipe 10 may converge into a single pipe, connecting to a wind speed adjustment mechanism 12, or the first exhaust pipe 9 and the second exhaust pipe 10 may be respectively connected to their respective wind speed adjustment mechanisms.

[0031] Preferably, the flow equalization plates 3 inside the first exhaust section 1 and / or the second exhaust section 2 are multi-layered, which can improve the flow equalization effect. The multi-layered flow equalization plates 3 are arranged parallel to the film conveying direction or inclined to the film conveying direction; for example... Figure 4 In the illustrated embodiment, the flow equalization plate 3 consists of two layers arranged parallel to each other (horizontally) along the film conveying direction; in other embodiments, the flow equalization plate 3 is not parallel to the film conveying direction but at a certain angle, i.e., it is inclined. The flow equalization plate 3 has a plurality of air holes or a plurality of slit holes, and the air holes or slit holes in each layer are arranged oppositely or staggered. Relative arrangement means that the air holes are corresponding in the wind speed direction, and the line connecting several corresponding air holes is consistent with the wind speed direction; staggered arrangement means that the air holes are staggered in the wind speed direction. In some embodiments, the air holes are, for example, small holes, closely arranged on the flow equalization plate 3; in other embodiments, the air holes are arranged strip-shaped holes, or the flow equalization plate 3 is grid-like or mesh-like; or it is a combination of various hole types; the slit holes are elongated slit-shaped holes, for example, one or more slit holes, and the length direction of the slit holes is, for example, parallel to the film width direction or inclined at a certain angle.

[0032] As a preferred application of this solution, this utility model provides a casting film machine, more specifically, for example, a casting film machine for producing polyimide films using a chemical method. Please refer to [link to relevant documentation]. Figure 5(This describes a portion of the structure of a casting film machine), which includes air supply components positioned above and below the film conveying channel. The film conveying channel contains a steel belt, on which the film (slurry) moves and solidifies within the sealed housing (oven) of the casting film machine. The key improvement of this design lies in its inclusion of several working zones, separated by a negative pressure air curtain device for film conveying, as described in this invention, thus ensuring that the temperature and gas levels in each working zone are independent. Taking a casting film machine that produces polyimide film using a chemical method as an example, the working zones are chemical reaction zones at different temperatures. More specifically, the sealed housing of the casting film machine is divided into multiple working zones. These working zones, as well as the inlet and outlet of the sealed housing and the outside, are separated by partitions. Each partition is equipped with a negative pressure air curtain device suitable for film conveying. For example, the first exhaust unit 1 (first airtight air box 7) and the second exhaust unit 2 (second airtight air box 8) are fixed to the partitions by bolts. Naturally, the partitions do not obstruct the entry and exit of the film (and steel belt). According to some embodiments, each working zone has a set of opposing negative pressure air curtain devices located on the inlet and outlet sides, or the negative pressure air curtain device is only located on the inlet side of the working zone, or only on the outlet side of the working zone. Figure 5 In the specific embodiment shown, a negative pressure air curtain device is installed only on the outlet side within the working area or between two working areas.

[0033] Furthermore, the enclosure is equipped with an air curtain outlet, and the ends of the first exhaust pipe 9 and the second exhaust pipe 10 are sealed to the outlet of the enclosure. The specific configuration of the exhaust pipes can be designed according to the situation, for example, connecting to the top or side wall of the enclosure. The first exhaust pipe 9 and the second exhaust pipe 10 are also equipped with, for example, an exhaust gas treatment system at the rear end of the fan. The relevant components / systems are existing technology and will not be described in detail here.

[0034] In summary, this negative pressure air curtain device can be optionally installed at the input / output end of the equipment enclosure, between two adjacent equipment enclosures, or inside a single equipment enclosure to partition different process environment zones, such as temperature zones, etc. This allows it to meet various complex process requirements. Furthermore, the presence of the negative pressure air curtain creates local transition zones between process environment zones, preventing issues such as sudden temperature changes in the membrane upon entering a particular area. This negative pressure air curtain device uses two opposing exhaust units that simultaneously draw air, each equipped with a flow equalization plate to ensure uniform airflow intensity. A negative pressure air curtain is formed in the channel space between the two exhaust units, allowing the membrane to pass through the channel space between the two spaces. Because of the negative pressure air curtain between these two spaces, issues such as temperature and gas interaction (e.g., escape / cross-contamination of gases with different temperatures and compositions) are avoided, effectively ensuring the accuracy and stability of process environment control in high-end processes.

Claims

1. A negative pressure air curtain device suitable for film conveying, characterized in that, It includes a first exhaust section (1) and a second exhaust section (2) arranged opposite to each other. At least one flow equalization plate (3) is provided in the first exhaust section (1) and / or the second exhaust section (2). A channel space (4) is formed between the first exhaust section (1) and the second exhaust section (2). The width of the channel space (4) is adapted to the width of the film.

2. The negative pressure air curtain device for film conveying according to claim 1, characterized in that, The entrance and / or exit of the channel space (4) are provided with an adjustable windbreak mechanism, which has a space reserved to match the thickness of the film.

3. The negative pressure air curtain device for film conveying according to claim 2, characterized in that, The adjustable wind deflector includes at least one slit baffle (6) located on the first exhaust section (1) and / or the second exhaust section (2).

4. The negative pressure air curtain device suitable for film conveying according to any one of claims 1 to 3, characterized in that, A wind speed acquisition device (11) is provided at the flow equalization plate (3), and a wind speed adjustment mechanism (12) is connected to the outside of the first exhaust section (1) and / or the second exhaust section (2).

5. The negative pressure air curtain device for film conveying according to claim 4, characterized in that, The first exhaust section (1) and the second exhaust section (2) are arranged vertically and vertically respectively.

6. The negative pressure air curtain device for film conveying according to claim 5, characterized in that, The flow equalization plate (3) inside the first exhaust section (1) and / or the second exhaust section (2) is arranged in multiple layers. The multi-layered flow equalization plate (3) is arranged parallel to the film conveying direction or inclined to the film conveying direction. The flow equalization plate (3) has a number of air holes or a number of slit holes. The air holes or slit holes in each layer are arranged opposite to each other or staggered.

7. The negative pressure air curtain device for film conveying according to claim 6, characterized in that, The first exhaust section (1) and / or the second exhaust section (2) are connected to exhaust pipes, and the wind speed adjustment mechanism (12) is located at the outer end of the exhaust pipe; It also includes channel side plates (5) disposed on both sides, the channel side plates (5) together with the flow equalization plates (3) of the first exhaust section (1) and the second exhaust section (2) to form the side wall of the channel space (4).

8. A casting film machine, characterized in that, It comprises several working zones, which are separated by a negative pressure air curtain device suitable for film conveying according to any one of claims 1-7.

9. The casting film machine according to claim 8, characterized in that, The working areas are separated by partitions, and each partition is equipped with a negative pressure air curtain device suitable for film conveying.

10. The casting film machine according to claim 9, characterized in that, A set of opposing negative pressure air curtain devices suitable for film conveying is provided in each working section, located on the inlet side and the outlet side respectively, or the negative pressure air curtain devices suitable for film conveying are provided only on the inlet side of the working section, or only on the outlet side of the working section.

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